Matrix user forums

Hello.
I wish to update some numerical parameter on a display ILI9341 as fast as possible with PIC24F16KA101 running at 32 MHz.
With a simple program that write the same word in different combinations of R-G-B colours just for a speed test and using software SPI (if I'm not wrong), I measure a clock frequency of ~ 900 KHz and the result isn't so good.

This display should operate at a much higher speed; I've seen some web videos with impressive graphical updating speed with arduino perhaps. I saw some other posts about that "issue" but I don't know what I can do to get it working faster. For example there is a post where Leigh suggest removing some instructions in the PIC16BIT_CAL_SPI.c file ...

https://www.matrixtsl.com/mmforums/view ... 250#p85250

... but it seems to allow only a modest speed increase of 20% or similar (not tested yet) but I hope to jump to a clock of 5 - 10 MHz if it is possible.
Maybe some wrong SPI settings or wrong project options?
Any suggestion ?

Anotgher issue: the macro Print " " useful to delete text from the display, seems not to work.


Thanks and best regard
Rov

Hi Rov,

Have you tried the SPI version of the component that uses the SPI hardware rather then a bit banged SPI interface. This should run a air bit quicker for you.

Hi Ben
So the component named "GLCD (ILI9341)" is a software SPI component and the "GLCD (ILI9341 SPI)" is the Harwdare SPI one ?
I tried the Hardware version as you suggested and the clock was ~ 3 MHz, a good improvement.
Thanks.
But in that way I'm forced to use PIC's Pin 16 for Data and Pin 15 for Clock (is it true?) and I should use Pin 15 for HLVDIN functions ...
Ad I also loose the possibility to use Pin 17 reserved for "Miso" even if I don't need that function with the Display...

And what can I do for the other problem (Print " " does not work)

Thanks and regards
Rov